CN114517798B - Hydraulic drive system and working machine - Google Patents
Hydraulic drive system and working machine Download PDFInfo
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- CN114517798B CN114517798B CN202210171075.0A CN202210171075A CN114517798B CN 114517798 B CN114517798 B CN 114517798B CN 202210171075 A CN202210171075 A CN 202210171075A CN 114517798 B CN114517798 B CN 114517798B
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- oil port
- pedal
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
Abstract
The invention provides a hydraulic drive system and a working machine. The hydraulic driving system comprises a hydraulic pump, a reversing valve, an explosion-proof valve assembly, a pilot valve assembly, a hydraulic cylinder and an oil tank. One side of the reversing valve is connected with the hydraulic pump and the oil tank, and the other side of the reversing valve is connected with the explosion-proof valve assembly and the hydraulic cylinder. And the pilot valve assembly is connected with a control oil circuit of the reversing valve and a control oil circuit of the explosion-proof valve. The reversing valve comprises an extending position and a contracting position, and the pilot valve assembly can control the reversing valve to switch between the extending position and the contracting position; the explosion-proof valve assembly comprises a bidirectional conduction position, and the pilot valve assembly simultaneously controls the explosion-proof valve assembly to be always in the bidirectional conduction position in the process of switching between the extension position and the contraction position. The system can greatly reduce noise caused by frequent opening and closing of the check valve in the explosion-proof valve assembly.
Description
Technical Field
The invention relates to the technical field of hydraulic drive systems, in particular to a hydraulic drive system and a working machine.
Background
Work machines are typically provided with a hydraulic drive system for driving an actuator. For example, an excavator is generally provided with a hydraulic drive system for driving a boom and an arm to operate. In order to solve the safety problem caused by burst of the pipeline, an explosion-proof valve is usually installed in the system. In existing hydraulic drive systems, the hydraulic pump typically supplies oil to the cylinders via a one-way valve in an explosion-proof valve. Because the oil pressure in the hydraulic pipeline has certain fluctuation, the check valve in the explosion-proof valve can be frequently opened and closed, so that larger noise can be generated in the explosion-proof valve.
Disclosure of Invention
The invention provides a hydraulic driving system and a working machine, which are used for solving the problem of large working noise of an explosion-proof valve in the existing hydraulic driving system.
According to a first aspect of the present invention, there is provided a hydraulic drive system comprising: the hydraulic pump, the switching-over valve, explosion-proof valve subassembly, pilot valve subassembly, pneumatic cylinder and oil tank.
One side of the reversing valve is connected with the hydraulic pump and the oil tank, and the other side of the reversing valve is connected with the explosion-proof valve component and the hydraulic cylinder. The pilot valve component is connected with a control oil circuit of the reversing valve and a control oil circuit of the explosion-proof valve component.
The reversing valve includes an extended position and a retracted position. The pilot valve assembly is capable of controlling the reversing valve to switch between an extended position and a retracted position. The explosion proof valve assembly includes a bi-directional conductive position. In the process of switching the reversing valve between the extending position and the contracting position, the pilot valve assembly simultaneously controls the explosion-proof valve assembly to be always in the bidirectional conducting position.
According to the hydraulic drive system provided by the invention, the reversing valve comprises an extension position control oil port and a retraction position control oil port. The pilot valve assembly is connected with the extension position control oil port and the contraction position control oil port and is used for providing control oil for the extension position control oil port and the contraction position control oil port. The pilot valve assembly includes a shuttle valve. The first oil inlet of the shuttle valve is connected with the shrinkage position control oil port. And the second oil inlet of the shuttle valve is connected with the extension control oil port. And an oil outlet of the shuttle valve is connected with a control oil port of the explosion-proof valve assembly.
According to the hydraulic driving system provided by the invention, the hydraulic cylinder comprises a rod cavity and a rodless cavity. The reversing valve comprises a three-position four-way electromagnetic reversing valve. The three-position four-way electromagnetic reversing valve comprises a first oil port, a second oil port, a third oil port and a fourth oil port. The first oil port is connected with an outlet of the hydraulic pump. The second oil port is connected with the rod cavity through the explosion-proof valve component. The third oil port is connected with the rodless cavity. The fourth oil port is connected with the oil tank.
According to the hydraulic driving system provided by the invention, the three-position four-way electromagnetic reversing valve comprises an extending position, a contracting position and a stopping position. And two ends of the three-position four-way electromagnetic reversing valve are respectively provided with a contraction position control oil port and an extension position control oil port.
And in a state that the pilot valve assembly is used for introducing control oil into the shrinkage position control oil port, the three-position four-way electromagnetic reversing valve is switched to the shrinkage position. And in a state that the pilot valve assembly is used for introducing control oil to the control oil port of the extending position, the three-position four-way electromagnetic reversing valve is switched to the extending position. And in a state that no control oil is output in the pilot valve assembly, the three-position four-way electromagnetic reversing valve is switched to a cut-off position.
According to the hydraulic drive system provided by the invention, the explosion-proof valve assembly further comprises a one-way valve conducting position.
In the contracted position, the first oil port is communicated with the second oil port. The third oil port is communicated with the fourth oil port. The hydraulic pump supplies oil to the rod cavity through the reversing valve and the explosion-proof valve component. Hydraulic oil in the rodless cavity flows back to the oil tank through the reversing valve.
In the extending position, the first oil port is communicated with the third oil port. The second oil port is communicated with the fourth oil port.
The hydraulic pump supplies oil to the rodless cavity through the reversing valve. Hydraulic oil in the rod cavity flows back to the oil tank through the explosion-proof valve assembly and the reversing valve.
In the stop position, the first oil port, the second oil port, the third oil port and the fourth oil port are mutually stopped. The explosion-proof valve assembly is switched to the one-way valve conducting position.
According to the present disclosure, a hydraulic drive system is provided, a pilot valve assembly includes a first foot valve and a second foot valve. The first pedal valve comprises a first pedal oil port, a second pedal oil port and a third pedal oil port. The second pedal valve comprises a fourth pedal oil port, a fifth pedal oil port and a sixth pedal oil port.
The first pedal oil port and the fourth pedal oil port are communicated with the oil tank. The second pedal oil port and the fifth pedal oil port are both connected with a control oil source. The third pedal oil port is connected with the shrinkage position control oil port. The sixth pedal oil port is connected with the extension position control oil port.
The first pedal valve is in a pedal state, the second pedal oil port is communicated with the third pedal oil port, and the second pedal oil port supplies control oil to the shrinkage position control oil port. The first pedal valve is in the state of not stepping on, and first pedal hydraulic fluid port and third pedal hydraulic fluid port intercommunication, shrink position control hydraulic fluid port and oil tank intercommunication.
The second pedal valve is in a pedal state, the fifth pedal oil port is communicated with the sixth pedal oil port, and the fifth pedal oil port supplies control oil to the extension position control oil port. The second pedal valve is in an un-pedal state, the fourth pedal oil port is communicated with the sixth pedal oil port, and the extension position control oil port is communicated with the oil tank.
According to the hydraulic drive system provided by the invention, the pilot valve assembly further comprises a shuttle valve. The first oil inlet of the shuttle valve is connected with the third pedal oil port. And the second oil inlet of the shuttle valve is connected with the sixth pedal oil port. And an oil outlet of the shuttle valve is connected with a control oil port of the explosion-proof valve assembly.
According to the present invention, a hydraulic drive system is provided, an explosion proof valve assembly includes an explosion proof valve main valve. The main valve of the explosion-proof valve comprises a one-way valve conduction position and a two-way conduction position. An oil outlet of the shuttle valve is connected with a control oil port of the main valve of the explosion-proof valve.
According to the hydraulic drive system provided by the invention, the explosion-proof valve assembly further comprises an overflow valve. The overflow valve is arranged between the oil inlet and the oil return port of the rod cavity and the oil outlet of the shuttle valve.
According to the hydraulic driving system provided by the invention, a throttle valve is arranged between the overflow valve and the oil outlet of the shuttle valve. The throttle valve is provided with a check valve in parallel.
According to a second aspect of the present invention there is provided a work machine comprising a hydraulic drive system as described above.
In the hydraulic driving system provided by the invention, one side of the reversing valve is connected with the hydraulic pump and the oil tank, and the other side of the reversing valve is connected with the explosion-proof valve assembly and the hydraulic cylinder. The pilot valve component is connected with a control oil circuit of the reversing valve and a control oil circuit of the explosion-proof valve. The reversing valve includes an extended position and a retracted position, and the pilot valve assembly is capable of controlling the reversing valve to switch between the extended position and the retracted position. The explosion-proof valve assembly comprises a bidirectional conduction position, and the pilot valve assembly simultaneously controls the explosion-proof valve assembly to be always in the bidirectional conduction position in the process of switching between the extension position and the contraction position of the reversing valve.
In the working process, the pilot valve assembly can control the explosion-proof valve assembly to be switched to the bidirectional conduction position while controlling the reversing valve to be switched to the contraction position. When the reversing valve is switched to the contraction position, the hydraulic pump can supply oil to the rod cavity of the hydraulic cylinder through the reversing valve and the bidirectional conduction position of the explosion-proof valve assembly. The hydraulic oil in the rodless cavity of the hydraulic cylinder flows back into the oil tank through the reversing valve, and therefore the piston rod of the hydraulic cylinder is retracted.
The pilot valve assembly can control the reversing valve to be switched to the extending position and simultaneously control the explosion-proof valve assembly to be switched to the bidirectional conducting position. When the reversing valve is switched to the extended position, the hydraulic pump can supply oil to the rodless cavity of the hydraulic cylinder through the reversing valve. Hydraulic oil in a rod cavity of the hydraulic cylinder flows back to the oil tank through the bidirectional conduction position of the explosion-proof valve assembly and the reversing valve, and therefore a piston rod of the hydraulic cylinder extends out. That is, the supply oil of the hydraulic pump and the return oil of the hydraulic cylinder are respectively delivered to the hydraulic cylinder or the oil tank through the bidirectional conduction position of the explosion-proof valve assembly.
Through the structure, the pilot valve assembly can control the reversing valve to be switched to the contraction position and simultaneously control the explosion-proof valve assembly to be switched to the bidirectional conduction position. The pilot valve assembly can control the reversing valve to be switched to the extending position and simultaneously control the explosion-proof valve assembly to be switched to the bidirectional conducting position. Thus, both the supply oil from the hydraulic pump to the hydraulic cylinder and the return oil from the hydraulic cylinder to the oil tank can be transmitted through the bi-directional conduction position of the explosion-proof valve assembly. Thus, noise caused by frequent opening and closing of the check valve in the explosion-proof valve assembly can be greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic system diagram of a hydraulic drive system provided by the present invention;
reference numerals:
100: a hydraulic pump; 200: a reversing valve;
201: three-position four-way electromagnetic reversing valve; 202: an extended position;
203: shrinking; 204: a cut-off position;
205: a first oil port; 206: a second oil port;
207: a third oil port; 208: a fourth oil port;
209: a contraction position control oil port; 210: an extension control oil port;
300: an explosion-proof valve assembly; 301: a main valve of the explosion-proof valve;
302: a check valve conduction position; 303: a bi-directional conduction bit;
304: an overflow valve; 305: a throttle valve;
306: a one-way valve; 400: a hydraulic cylinder;
401: a rod cavity is arranged; 402: a rodless cavity;
500: a pilot valve assembly; 501: a first foot valve;
502: a second foot valve; 503: the first pedal oil port;
504: a second pedal oil port; 505: a third pedal oil port;
506: a fourth pedal oil port; 507: a fifth pedal oil port;
508: a sixth pedal oil port; 509: a shuttle valve;
600: and an oil tank.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples, as well as features of various embodiments or examples, described in this specification may be combined and combined to further clarify the objects, aspects and advantages of embodiments of the present invention, without departing from the spirit and scope of the invention, and it should be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A hydraulic drive system according to an embodiment of the present invention is described below with reference to fig. 1. It should be understood that the following description is only illustrative of the embodiments of the invention and is not intended to limit the invention in any way.
An embodiment of the present invention provides a hydraulic drive system, as shown in fig. 1, including: hydraulic pump 100, reversing valve 200, explosion proof valve assembly 300, pilot valve assembly 500, hydraulic cylinder 400, and oil tank 600.
The reversing valve 200 has one side connected to the hydraulic pump 100 and the oil tank 600 and the other side connected to the explosion-proof valve assembly 300 and the hydraulic cylinder 400. The pilot valve assembly 500 is connected to a control oil path of the reversing valve 200 and a control oil path of the explosion-proof valve assembly 300.
The reversing valve 200 includes an extended position 202 and a retracted position 203. The pilot valve assembly 500 is capable of controlling the reversing valve 200 to switch between an extended position 202 and a retracted position 203. The explosion proof valve assembly 300 includes a bi-directional pass-through bit 303. During the switching of the reversing valve 200 between the extended position 202 and the retracted position 203, the pilot valve assembly 500 simultaneously controls the explosion proof valve assembly 300 to be always in the bi-directional conductive position 303.
During operation, pilot valve assembly 500 controls switching of reversing valve 200 to pinch position 203 while pilot valve assembly 300 is controlled to switch to bi-directional conducting position 303. When the directional valve 200 is shifted to the contracted position 203, the hydraulic pump 100 can supply oil to the rod chamber 401 of the hydraulic cylinder 400 through the directional valve 200 and the bi-directional communication position 303 of the explosion proof valve assembly 300. The hydraulic oil in the rodless chamber 402 of the hydraulic cylinder 400 flows back into the oil tank 600 through the directional valve 200, whereby the piston rod of the hydraulic cylinder 400 is retracted. The pilot valve assembly 500 is also capable of controlling the switching of the explosion proof valve assembly 300 to the bi-directional pass-through position 303 while controlling the switching of the reversing valve 200 to the extended position 202. When the reversing valve 200 is shifted to the extended position 202, the hydraulic pump 100 is able to supply oil through the reversing valve 200 into the rodless chamber 402 of the hydraulic cylinder 400. The hydraulic oil in the rod chamber 401 of the hydraulic cylinder 400 flows back into the oil tank 600 through the bi-directional conduction position 303 of the explosion-proof valve assembly 300 and the directional valve 200, whereby the piston rod of the hydraulic cylinder 400 is extended. That is, the supply oil of the hydraulic pump 100 and the return oil of the hydraulic cylinder 400 are respectively supplied to the hydraulic cylinder 400 or the oil tank 600 through the bi-directional communication position 303 of the explosion-proof valve assembly 300.
With this configuration, the pilot valve assembly 500 is able to control the switching of the explosion proof valve assembly 300 to the bi-directional conduction position 303 while controlling the switching of the reversing valve 200 to the retract position 203. The pilot valve assembly 500 is also capable of controlling the switching of the explosion proof valve assembly 300 to the bi-directional pass-through position 303 while controlling the switching of the reversing valve 200 to the extended position 202. Thus, both the supply oil from the hydraulic pump 100 to the hydraulic cylinder 400 and the return oil from the hydraulic cylinder 400 to the tank 600 can be transmitted through the bidirectional conduction position 303 of the explosion-proof valve assembly 300. Thereby, noise caused by frequent opening and closing of the check valve in the explosion proof valve assembly 300 can be greatly reduced.
In one embodiment of the present invention, the reversing valve 200 includes an extended position control port 210 and a retracted position control port 209. The pilot valve assembly 500 is connected to the extension control port 210 and the retraction control port 209, and is configured to provide control oil to the extension control port 210 and the retraction control port 209. The pilot valve assembly 500 includes a shuttle valve 509, a first oil inlet of the shuttle valve 509 being connected to the retract-position control port 209. The second oil inlet of the shuttle valve 509 is connected to the extension control port 210. The oil outlet of the shuttle valve 509 is connected to the control port of the explosion proof valve assembly 300.
As can be seen from the above-described embodiments, by installing the shuttle valve 509 between the control oil path of the reversing valve 200 and the control oil path of the pilot valve assembly 500 and connecting the oil outlet of the shuttle valve 509 with the control oil port of the explosion-proof valve assembly 300, the control oil of the pilot valve assembly 500 can always enter the control oil path of the explosion-proof valve assembly 300 through the shuttle valve 509. Thus, the operation position switching action of the explosion-proof valve assembly 300 is conveniently, rapidly and inexpensively implemented.
In one embodiment of the invention, hydraulic cylinder 400 includes a rod chamber 401 and a rodless chamber 402. The reversing valve 200 includes a three-position four-way solenoid reversing valve 201. The three-position four-way electromagnetic directional 201 valve comprises a first oil port 205, a second oil port 206, a third oil port 207 and a fourth oil port 208. The first port 205 is connected to an outlet of the hydraulic pump 100. The second port 206 is connected to the rod chamber 401 through the explosion-proof valve assembly 300. The third port 207 is connected to the rodless cavity 402. The fourth port 208 is connected to the oil tank 600.
Further, in one embodiment of the present invention, three-position, four-way solenoid directional valve 201 includes an extended position 202, a retracted position 203, and a shut-off position 204. Two ends of the three-position four-way electromagnetic directional valve 201 are respectively provided with a contraction position control oil port 209 and an extension position control oil port 210.
In a state where the pilot valve assembly 500 is supplied with control oil to the contracted position control port 209, the three-position four-way electromagnetic directional valve 201 is switched to the contracted position 203. The three-position four-way solenoid directional valve 201 is switched to the extended position 202 in a state where the pilot valve assembly 500 is supplied with control oil to the extended position control oil port 210. In the state where there is no control oil output in the pilot valve assembly 500, the three-position four-way electromagnetic directional valve 201 is switched to the cutoff position 204.
Still further, in one embodiment of the present invention, the explosion protection valve assembly 300 further includes a check valve on position 302.
In the contracted position 203, the first port 205 communicates with the second port 206. The third port 207 communicates with the fourth port 208. The hydraulic pressure 100 pumps through the reversing valve 200 and the explosion proof valve assembly 300 to supply oil into the rod chamber 401. Hydraulic oil in the rodless chamber 402 flows back to the oil tank 600 through the directional valve 200.
In the extended position 202, the first port 205 communicates with the third port 207. The second port 206 communicates with the fourth port 208. The hydraulic pump 100 supplies oil to the rodless chamber 402 through the reversing valve 200. Hydraulic oil in the rod chamber 401 flows back to the oil tank 600 through the explosion-proof valve assembly 300 and the reversing valve 200.
In the shutoff position 204, the first port 205, the second port 206, the third port 207, and the fourth port 208 are mutually shut off, and the explosion proof valve assembly 300 is switched to the check valve on position 302.
Specifically, as shown in fig. 1, the three-position four-way electromagnetic directional valve 201 has a contracted position 203 at the left, a blocked position 204 at the middle, and an extended position 202 at the right. The first oil port 205 of the three-position four-way electromagnetic directional valve 201 is positioned at the left lower part and is connected with the oil outlet of the hydraulic pump 100, and the oil inlet of the hydraulic pump 100 is connected with the oil tank 600. The second oil port 206 of the three-position four-way electromagnetic directional valve 201 is located at the upper left and is connected to one end of the explosion-proof valve assembly 300. The other end of the explosion proof valve assembly 300 is connected to a rod chamber 401 of the hydraulic cylinder 400. The third oil port 207 of the three-position four-way electromagnetic directional valve 201 is positioned at the upper right and is communicated with the rodless cavity 402 of the hydraulic cylinder 400. The fourth oil port 208 of the three-position four-way electromagnetic directional valve 201 is located at the lower right and is communicated with the oil tank 600.
The left end of the three-position four-way electromagnetic directional valve 201 is provided with a contraction position control oil port 209, and the right end is provided with an extension position control oil port 210.
When the pilot valve assembly 500 introduces control oil to the contracting position control oil port 209, the control oil drained to the left side of the three-position four-way electromagnetic directional valve 201 can overcome the spring force and push the valve core to move rightward. Thereby, the three-position four-way electromagnetic directional valve 201 is switched to the contraction position 203 on the left side. The pilot valve assembly 500 can drain part of the control oil to the control oil port of the explosion-proof valve assembly 300 while introducing the control oil to the contraction position control oil port 210, so that the explosion-proof valve assembly 300 is switched to the bidirectional conduction position 303.
At this time, the first port 205 communicates with the second port 206, and the third port 207 communicates with the fourth port 208. After passing through the first oil port 205 and the second oil port 206, the hydraulic oil at the outlet of the hydraulic pump 100 enters the rod cavity 401 of the hydraulic cylinder 400 from the bidirectional conducting position 303 of the explosion-proof valve assembly 300. Hydraulic oil in the rodless 402 chamber of the hydraulic cylinder 400 flows back into the oil tank 600 through the third port 207 and the fourth port 208. The piston rod of the hydraulic cylinder 400 is contracted toward the inside of the cylinder body.
When the pilot valve assembly 500 passes control oil into the extension control oil port 210, the control oil drained to the right side of the three-position four-way electromagnetic directional valve 201 can overcome the spring force and push the valve core to move leftwards. Thereby, the three-position four-way electromagnetic directional valve 201 is switched to the projecting position 202 on the right side. The pilot valve assembly 500 can drain part of the control oil to the control oil port of the explosion-proof valve assembly 300 while introducing the control oil to the extension control oil port 210, so that the explosion-proof valve assembly 300 is switched to the bidirectional conduction position 303.
At this time, the first port 205 communicates with the third port 207, and the second port 206 communicates with the fourth port 208. Hydraulic oil at the outlet of the hydraulic pump 100 enters the rodless chamber 402 of the hydraulic cylinder 400 through the first port 205 and the third port 207. After passing through the bi-directional conducting position 303 in the explosion-proof valve assembly 300, the hydraulic oil in the rod cavity 401 of the hydraulic cylinder 400 flows back into the oil tank 600 from the second oil port 206 and the fourth oil port 208. The piston rod of the hydraulic cylinder 400 protrudes outside the cylinder body.
When the pilot valve assembly 500 is in a non-operational state, that is, there is no control oil output in the pilot valve assembly 500. At this time, the three-position four-way electromagnetic directional 201 valve is in the neutral position, i.e., the off position 204. The explosion proof valve assembly 300 is in an initial state, i.e., the check valve on position 302. At this time, the first port 205, the second port 206, the third port 207, and the fourth port 208 are blocked from each other. The check valve in the explosion proof valve assembly 300 can form a pressure maintaining effect on the rod chamber 401 of the hydraulic cylinder 400. The third port 207 in the reversing valve 200 is capable of creating a dwell against the rodless chamber 402 of the hydraulic cylinder 400.
Through this kind of structure setting, this hydraulic drive system not only can reduce the noise that produces in the explosion-proof valve subassembly 300, can also form reliable pressurize effect to pneumatic cylinder 400 when needs, and then greatly promoted the stability and the security of pneumatic cylinder 400 work.
For example, in one embodiment of the present invention, the pilot valve assembly 500 includes a first foot valve 501 and a second foot valve 502. The first foot valve 501 includes a first foot port 503, a second foot port 504, and a third foot port 505. The second foot valve 502 includes a fourth foot port 506, a fifth foot port 507, and a sixth foot port 508.
The first pedal port 503 and the fourth pedal port 506 are both in communication with the fuel tank. The oil tank may be the same oil tank connected to the hydraulic pump or another oil tank. The second pedal port 504 and the fifth pedal port 507 are both connected to a control oil source. The control oil source referred to herein is a pressure oil source capable of satisfying the reversing pressure of the reversing valve 200 and the explosion-proof valve assembly 300. Third pedal port 505 is connected to retraction position control port 209. The sixth pedal port 508 is connected to the extension control port 210.
The first foot valve 501 is in a pedal state, and the second foot port 504 communicates with the third foot port 505. The second foot pedal port 504 supplies control oil to the contracted position control port 209. The first pedal valve 501 is in an un-stepped state, and the first pedal port 503 communicates with the third pedal port 505. The retraction control port 209 communicates with the fuel tank 600.
The fifth pedal oil port 507 communicates with the sixth pedal oil port 508 in the pedal state of the second pedal valve 502. The fifth pedal oil port 507 supplies control oil to the extension control oil port 210. The second foot valve 502 is in an un-stepped state, the fourth foot port 506 communicates with the sixth foot port 508, and the extension control port 210 communicates with the fuel tank 600.
For example, in one embodiment of the present invention, the first oil inlet of the shuttle valve 509 is connected to the third pedal oil port 505. The second oil inlet of the shuttle valve 509 is connected to the sixth pedal oil port 508. The oil outlet of the shuttle valve 509 is connected to the control port of the explosion proof valve assembly 300.
For example, as shown in fig. 1, the first foot valve 501 is located on the left side. The upper right port of the first foot valve 501 is a first foot port 503, the lower right port is a second foot port 504, and the left port is a third foot port 505. The second foot valve 502 is located on the right side. The oil port at the upper left of the second pedal valve is a fourth pedal oil port 506, the oil port at the lower left is a fifth pedal oil port 507, and the oil port at the right side is a sixth pedal oil port 508.
Wherein the first pedal oil port 503 and the fourth pedal oil port 506 communicate with each other and with the oil tank 600. The second pedal port 504 and the fifth pedal port 507 communicate with each other and are connected to a control oil source. The control oil source has sufficient pressure to drive the reversing valve 200 and the explosion proof valve assembly 300 in reversing.
When the first foot valve 501 is manually operated, the second foot port 504 communicates with the third foot port 505. A part of the control oil flowing out through the third pedal oil port 505 is led to the contraction position control oil port 209 of the three-position four-way electromagnetic directional valve 201, so as to drive the three-position four-way electromagnetic directional valve 201 to reverse to the left position. Another part of the oil flowing out through the third pedal oil port 505 enters the interior of the shuttle valve 509 through the first oil inlet of the shuttle valve 509 and pushes the shuttle valve spool to the right, so that the part of the control oil is led to the control oil path of the explosion-proof valve assembly 300 through the outlet of the shuttle valve 509, and the explosion-proof valve assembly 300 is driven to be switched to the bidirectional conduction position 303.
When the second pedal valve 502 is manually pedal, the fifth pedal oil port 507 communicates with the sixth pedal oil port 508. A part of the control oil flowing out through the sixth pedal oil port 508 is drained to the extension position control oil port 210 of the three-position four-way electromagnetic directional valve 201, so as to drive the three-position four-way electromagnetic directional valve 201 to reverse to the right position. Another part of the oil flowing out through the sixth pedal oil port 508 enters the interior of the shuttle valve 509 through the second oil inlet of the shuttle valve 509 and pushes the shuttle valve spool to the left, so that the part of the control oil is led to the control oil path of the explosion-proof valve assembly 300 through the outlet of the shuttle valve 509 and drives the explosion-proof valve assembly 300 to switch to the bidirectional conduction position 303.
When both the first foot valve 501 and the second foot valve 502 are in the non-pedal state. The uncontrolled oil passes into the retract position control port 209, the extend position control port 210, and the control port of the explosion proof valve assembly 300. At this time, the three-position four-way electromagnetic directional valve 201 is in the neutral position. The explosion proof valve assembly 300 is in the check valve on position 302.
Here, the switching process of the communication state between the third pedal oil port 505 and the first pedal oil port 503 and the second pedal oil port 504 is a process that continuously changes with the pressing stroke of the foot pedal on the first pedal valve 501. Similarly, the communication state switching process between the sixth pedal oil port 508 and the fourth pedal oil port 506 and the fifth pedal oil port 507 is also a process that continuously changes with the pressing stroke of the foot pedal on the second pedal valve 502.
In one embodiment of the invention, the explosion proof valve assembly 300 includes an explosion proof valve main valve 301. The explosion proof valve main valve 301 includes a one-way valve-on position 302 and a two-way-on position 303. The oil outlet of the shuttle valve 509 is connected to the control port of the explosion proof valve main valve 301.
In one embodiment of the present invention, the explosion protection valve assembly 300 further includes an overflow valve 304. An overflow valve 304 is installed between the oil inlet and return port of the rod chamber 401 and the oil outlet of the shuttle valve 509.
Further, in yet another embodiment of the present invention, a throttle valve 305 is installed between the overflow valve 304 and the oil outlet of the shuttle valve 509. The throttle valve 305 is provided with a check valve 306 in parallel.
Specifically, as shown in fig. 1, a safety branch line is provided on the hydraulic line between the explosion proof valve assembly 300 and the oil inlet/outlet port of the rod chamber 401. The safety branch line communicates with the control oil path of the explosion-proof valve assembly 300. The relief valve 304 is provided in the relief branch pipe, the throttle valve 305 is provided between the relief valve 304 and the shuttle valve 509, and the check valve 306 is provided in parallel to the throttle valve 305. An oil filter is also installed between the relief valve 304 and the rod chamber 401 of the hydraulic cylinder 400.
When the pilot valve assembly 500 has control oil output, part of the control oil enters a control oil port of the explosion-proof valve assembly 300 through an outlet of the shuttle valve 509 and the check valve 306 connected in parallel with the throttle valve 305 to drive the explosion-proof valve assembly 300 to switch to the bidirectional conduction position 303.
When an abrupt condition such as burst occurs in the hydraulic line between the explosion-proof valve assembly 300 and the reversing valve 200, the pressure of the hydraulic line connected between the explosion-proof valve assembly 300 and the hydraulic cylinder 400 suddenly increases. When the pressure value is greater than the opening pressure of the relief valve 304, the relief valve 304 opens. At this time, part of the hydraulic oil flows to the outlet of the shuttle valve 509 through the throttle valve 305, and flows back to the tank through the first oil inlet or the second oil inlet of the shuttle valve 509.
Meanwhile, the check valve 306 connected in parallel with the throttle valve 305 can play a role in holding pressure. When the pressure reaches the index pressure of the explosion proof valve assembly 300, the portion of oil can drive the explosion proof valve assembly 300 to switch to the bi-directional conducting position 303. At this time, part of the oil in the rod chamber 401 of the hydraulic cylinder 400 flows to the external environment through the bidirectional conduction position 303. When the line pressure drops below the cracking pressure of the relief valve 304, the relief valve 304 closes.
Therefore, the descending speed of the working device mounted on the hydraulic cylinder 400 can be controlled, and further, safety accidents caused by sudden falling of the working device can be effectively avoided.
Embodiments of the second aspect of the present invention provide a work machine comprising a hydraulic drive arrangement as described above.
It should be noted here that the present invention is not limited in any way with respect to the specific type of work machine described above. For example, in one embodiment of the present disclosure, the work machine includes an excavator. The excavator includes a boom and an arm. The piston rod of the hydraulic cylinder 400 is connected to the boom or the arm, and is used to drive the boom or the arm to perform a corresponding work operation.
Further, since the work machine includes the hydraulic drive system as described above, it also has the advantages as described above.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A hydraulic drive system, comprising: a hydraulic pump, a reversing valve, an explosion-proof valve assembly, a pilot valve assembly, a hydraulic cylinder and an oil tank,
one side of the reversing valve is connected with the hydraulic pump and the oil tank, the other side of the reversing valve is connected with the explosion-proof valve component and the hydraulic cylinder, the pilot valve component is connected with a control oil way of the reversing valve and a control oil way of the explosion-proof valve component,
the reversing valve comprises an extending position and a contracting position, and the pilot valve assembly can control the reversing valve to switch between the extending position and the contracting position; the explosion-proof valve component comprises a bidirectional conduction position, the reversing valve is switched between the extending position and the contracting position, the pilot valve component simultaneously controls the explosion-proof valve component to be always in the bidirectional conduction position,
the reversing valve comprises an extension position control oil port and a contraction position control oil port, the pilot valve assembly is connected with the extension position control oil port and the contraction position control oil port and is used for providing control oil for the extension position control oil port and the contraction position control oil port, the pilot valve assembly comprises a shuttle valve, a first oil inlet of the shuttle valve is connected with the contraction position control oil port, a second oil inlet of the shuttle valve is connected with the extension position control oil port, and an oil outlet of the shuttle valve is connected with the control oil port of the explosion-proof valve assembly.
2. The hydraulic drive system of claim 1, wherein the hydraulic cylinder includes a rod cavity and a rodless cavity, the reversing valve includes a three-position four-way solenoid directional valve including a first port connected to an outlet of the hydraulic pump, a second port connected to the rod cavity through the explosion-proof valve assembly, a third port connected to the rodless cavity, and a fourth port connected to the oil tank.
3. The hydraulic drive system according to claim 2, wherein the three-position four-way electromagnetic directional valve includes the extended position, the retracted position, and the blocking position, both ends of the three-position four-way electromagnetic directional valve are respectively provided with the retracted position control oil port and the extended position control oil port,
the three-position four-way electromagnetic reversing valve is switched to the contraction position under the state that the pilot valve assembly is used for introducing control oil to the contraction position control oil port;
the three-position four-way electromagnetic reversing valve is switched to the extending position under the state that the pilot valve assembly is used for introducing control oil to the extending position control oil port;
and in a state that no control oil is output in the pilot valve assembly, the three-position four-way electromagnetic reversing valve is switched to the cut-off position.
4. The hydraulic drive system of claim 3 wherein the explosion proof valve assembly further comprises a check valve ON position,
in the contraction position, the first oil port is communicated with the second oil port, the third oil port is communicated with the fourth oil port, the hydraulic pump supplies oil to the rod cavity through the reversing valve and the explosion-proof valve assembly, and hydraulic oil in the rodless cavity flows back to the oil tank through the reversing valve;
in the extending position, the first oil port is communicated with the third oil port, the second oil port is communicated with the fourth oil port, the hydraulic pump supplies oil to the rodless cavity through the reversing valve, and hydraulic oil in the rod cavity flows back to an oil tank through the explosion-proof valve assembly and the reversing valve;
in the stop position, the first oil port, the second oil port, the third oil port and the fourth oil port are mutually stopped, and the explosion-proof valve assembly is switched to the one-way valve conduction position.
5. The hydraulic drive system of claim 4, wherein the pilot valve assembly includes a first foot valve and a second foot valve, the first foot valve including a first foot port, a second foot port, and a third foot port, the second foot valve including a fourth foot port, a fifth foot port, and a sixth foot port,
the first pedal oil port and the fourth pedal oil port are communicated with the oil tank, the second pedal oil port and the fifth pedal oil port are connected with a control oil source, the third pedal oil port is connected with the shrinkage position control oil port, the sixth pedal oil port is connected with the extension position control oil port,
the first pedal valve is in a pedal state, the second pedal oil port is communicated with the third pedal oil port, and the second pedal oil port supplies control oil to the contraction position control oil port; the first pedal valve is in an un-pedal state, the first pedal oil port is communicated with the third pedal oil port, and the shrinkage position control oil port is communicated with the oil tank;
the second pedal valve is in a pedal state, the fifth pedal oil port is communicated with the sixth pedal oil port, and the fifth pedal oil port supplies control oil to the extension position control oil port; the second pedal valve is in an un-pedal state, the fourth pedal oil port is communicated with the sixth pedal oil port, and the extension position control oil port is communicated with the oil tank.
6. The hydraulic drive system of claim 4, wherein the explosion proof valve assembly includes an explosion proof valve main valve including the one-way valve conducting position and the two-way conducting position, and wherein the oil outlet of the shuttle valve is connected to the control oil port of the explosion proof valve main valve.
7. The hydraulic drive system of claim 2, wherein the explosion proof valve assembly further comprises an overflow valve mounted between the oil inlet and return ports of the rod chamber and the oil outlet of the shuttle valve.
8. The hydraulic drive system according to claim 7, wherein a throttle valve is installed between the overflow valve and the oil outlet of the shuttle valve, and a check valve is disposed in parallel on the throttle valve.
9. A work machine comprising a hydraulic drive system according to any one of claims 1 to 8.
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| CN202210171075.0A CN114517798B (en) | 2022-02-23 | 2022-02-23 | Hydraulic drive system and working machine |
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| CN117249126B (en) * | 2023-11-16 | 2024-01-30 | 浙江大学 | Oil tank structure, hydraulic control system and working machine |
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